Two-Color Brioche Stitch With a Selvedge Edge
The light color (LC) forms knit columns on light side (LS) of the work; the dark color (DC) forms knit columns on the dark side (DS) and purl columns on the light side. Unlike single-color brioche stitch, both knit and purl brioche stitches are used in two-color brioche. The fundamentals are the same: the pattern alternates between creating a slipped stitch-yarnover pair (sl1yo) and working the pair formed in the previous row together as one stitch (either as brk or brp). To maintain the pattern and color integrity, the colors alternate every row and two light-side rows are followed by two dark-side rows. To do this, you’ll need to use circular or double-pointed needles so that the stitches can be slid to the opposite needle tip and worked again without turning the work.
Two-Color Brioche – Light Side (LS)                                     Two-Color Brioche Dark Side (DS)

Using Two-color Italian CO, beg and end with LC “k” st. Cast on a multiple of 2 sts + 1.
Set-Up Row DS LC: p1, *sl1yo, p1; rep from * to end. Drop knotted st from Two-color Italian Cast On. Do not turn; slide sts back to opposite end of needle.
Set-Up Row DS DC: sl1, *brk1, sl1yo; rep from * to last 2 sts, brk1, drop DC, leaving yarn to back, sl1. Turn work.
Row 1 LS LC: k1, *sl1yo, brk1; rep from * to last 2 sts, sl1yo, k1. Do not turn; slide.
Row 1 LS DC: sl1, *brp1, sl1yo; rep from * to last 2 sts, brp1, drop DC, leaving yarn to front, sl1. Turn work.
Row 2 DS LC: p1, *sl1yo, brp1; rep from * to last 2 sts, sl1yo, p1. Do not turn; slide.
Row 2 DS DC: sl1, *brk1, sl1yo; rep from * to last 2 sts, brk 1, drop DC, leaving yarn to back, sl1. Turn work.
Rep from Row 1 LS LC.
BO using Italian Bind Off.